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Fluorine-atom initiated oxidation of CF3CF2H (HFC-125) studied by FTIR spectroscopy: product yields and kinetic modelling
Abstract
A comprehensive study has been carried out of the
oxidation of CF
3
CF
2
H (HFC-125).
Reaction was initiated by continuous photolysis of
F
2
in the near-UV. The F atoms produced
abstracted a hydrogen atom from
CF
3
CF
2
H initiating oxidation in gas
mixtures containing variable amounts of O
2
and
made up to a total pressure of 700 Torr with N
2
.
Product yields were measured as a function of time using
FTIR spectroscopy. Experiments were performed at room
temperature and in mixtures containing different ratios of
[F
2
] to [CF
3
CF
2
H]. The
major products were COF
2
,
CF
3
O
3
CF
3
and
CF
3
O
3
C
2
F
5
,
consistent with C–C bond scission being the dominant
loss process for CF
3
CF
2
O radicals and
with previous studies which used chlorine atoms toinitiate
oxidation. Attempts to match the experimental results with
predictions using the FACSIMILE chemical modelling pro-gram
were moderately successful and confirmed recent results
regarding the equilibrium constant for:
F+O
2
(+M)=FO
2
(+M).
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